Darreh Shahr climate — normals and trends
Darreh Shahr (Iran) has a hot-summer mediterranean climate (Csa) under the Köppen-Geiger classification. Its mean annual temperature is 17.0 °C and it receives 496 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (29.9 °C on average) and the coldest is January (4.3 °C). Rainfall peaks in March.
Darreh Shahr averages 47 frost days, 135 hot days (≥ 30 °C) and 57 rainy days per year.
Darreh Shahr has warmed by +2.3 °C between 1940 and 2025, or +0.27 °C per decade. This trend is statistically significant.
The number of frost days there went from about 62 to 32 per year over the period.
The hottest day of the period reached 43.6 °C (on 12 August 2022) and the coldest -22.6 °C (on 9 February 1950).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
Darreh ShahrIlam Province
- coords
- 33.14°, 47.38°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
17.0°C
Average daily high
23.9°C
Average daily low
9.4°C
Annual rainfall
496mm
Sunshine / day
10.9h
Mean relative humidity
49%
Average peak wind
9.7km/h
Seasonal range
25.6°C
Frost days (< 0 °C)
47 d/yr
Hot days (≥ 30 °C)
135 d/yr
Rainy days (≥ 1 mm)
57 d/yr
Annual snowfall
14.5 cm
Average feels-like high
22.5 °C
Average feels-like low
6.9 °C
Average peak gust
29.2 km/h
Tropical nights (≥ 20 °C)
32 d/yr
Solar radiation
20.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.3 °C
since 1940
+0.3 °C per decade · r² = 0.38 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
43.6 °C
12 August 2022
Coldest day
-22.6 °C
9 February 1950
Wettest day
93 mm
1 April 2019
Windiest day
29.3 km/h
7 March 1994
Strongest gust
97.9 km/h
5 March 1983
Hottest feels-like
44.8 °C
27 July 2011
Coldest feels-like
-28.1 °C
9 February 1950
Snowiest day
21.1 cm
9 January 1950
Sunniest day
14.0 h
22 June 1941
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 11.5 °C | +1.9 °C | 26 mm | -58 mm |
| Feb | 10.9 °C | -0.6 °C | 65 mm | -13 mm |
| Mar | 17.8 °C | +2.2 °C | 104 mm | +11 mm |
| Apr | 24.7 °C | +3.3 °C | 36 mm | -23 mm |
| May | 33.5 °C | +5.2 °C | 6 mm | -12 mm |
| Jun | 37.1 °C | +2.2 °C | 0 mm | -0 mm |
| Jul | 40.1 °C | +1.9 °C | 0 mm | -0 mm |
| Aug | 41.0 °C | +3.3 °C | 0 mm | +0 mm |
| Sep | 35.0 °C | +1.4 °C | 0 mm | -0 mm |
| Oct | 29.5 °C | +3.2 °C | 0 mm | -19 mm |
| Nov | 22.0 °C | +4.4 °C | 12 mm | -50 mm |
| Dec | 12.3 °C | +0.5 °C | 123 mm | +41 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Darreh Shahr?
Darreh Shahr has a hot-summer mediterranean climate (Köppen Csa). Over 1940-2025, the average annual temperature is 17.0 °C and it receives 496 mm of precipitation per year.
What is the hottest day ever recorded in Darreh Shahr?
The hottest day measured in Darreh Shahr between 1940 and 2025 was 12 August 2022, reaching 43.6 °C.
What is the coldest day in Darreh Shahr?
The coldest day measured in Darreh Shahr between 1940 and 2025 was 9 February 1950, at -22.6 °C.
Does it snow in Darreh Shahr?
Yes. Darreh Shahr gets on average 14.5 cm of snow per year and has around 47 frost days.
Has the climate of Darreh Shahr warmed?
Yes: Darreh Shahr warmed by +2.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Darreh Shahr?
The wettest day measured in Darreh Shahr between 1940 and 2025 was 1 April 2019, with 93 mm of rain in 24 hours.
What was the windiest day in Darreh Shahr?
The windiest day measured in Darreh Shahr between 1940 and 2025 was 7 March 1994, with winds reaching 29.3 km/h.
What is the warmest month in Darreh Shahr?
The warmest month in Darreh Shahr is July (29.9 °C on average); the coldest is January (4.3 °C).
How much does it rain in Darreh Shahr?
Darreh Shahr receives on average 496 mm of precipitation per year, spread over about 57 rainy days.
Is it sunny in Darreh Shahr?
Darreh Shahr gets on average 10.9 hours of sunshine per day, roughly 3,979 hours per year over 1940-2025.
What is the biggest single-day snowfall in Darreh Shahr?
The heaviest 24-hour snowfall measured in Darreh Shahr between 1940 and 2025 was 9 January 1950, with 21.1 cm.
Are there tropical nights in Darreh Shahr?
Yes: Darreh Shahr has on average 32 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Darreh Shahr?
In Darreh Shahr, between 1940 and 2025, the highest apparent temperature reached 44.8 °C on 27 July 2011, and the lowest was -28.1 °C on 9 February 1950.
Compare Darreh Shahr with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Darreh Shahr